JP2000010187A - Projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection type display device whose productivity is improved and which makes a contribution to miniaturization by making a member common. SOLUTION: An optical modulator driving means 80 driving and controlling the optical modulators 925R, 925G and 925B of the projection type display device is divided into an individual setting part 81 the setting of which differs in accordance with the specifications of the modulators 925R, 925G and 925B and a common setting part 82 which is made common regardless of the specifications of the modulators 925R, 925G and 925B. Since the setting part 81 is divided from the setting part 82, the productivity of the projection type display device is improved by making the setting part 82 common. By dividing the part 80, the degree of freedom in terms of arrangement inside the device is improved, whereby the device is miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a light source, an optical system for optically processing a light beam emitted from the light source to form an optical image corresponding to image information, and an image formed by the optical system. And a projection lens for enlarging and projecting the image on a projection surface.

[0002]

2. Description of the Related Art Conventionally, a light source lamp, an optical system that optically processes a light beam emitted from the light source lamp to form an optical image corresponding to image information, and projects an image formed by the optical system 2. Description of the Related Art A projection display device including a projection lens for enlarging and projecting an image on a surface is known. Such projection display devices are widely used for multimedia presentations at conferences, conferences, exhibitions, and the like.

A video, a computer, and the like are connected to the above-mentioned projection display device, and image information output from a device such as a video or a computer is modulated by a light modulation device constituting an optical system. The type display device can form an optical image according to image information.
Specifically, a composite signal serving as image information, RGB
The signal is supplied to the light modulation device via light modulation device driving means for driving and controlling the light modulation device. The light modulation device driving means converts an image signal such as a composite signal or an RGB signal into a signal form suitable for image display by predetermined signal processing, and supplies the converted signal to a portion for driving the light modulation device. It is. Conventionally, such a light modulator driving means has been integrally formed on a single circuit board as a circuit for driving the light modulator by an input image signal.

[0004]

However, the conventional light modulator driving means formed on a single circuit board has the following problems. That is, the light modulation device driving means processes a portion set according to the specifications of the light modulation device, such as the resolution of the light modulation device such as VGA and SVGA, and a composite signal, an RGB signal, and the like so as to be suitable for image display. And other parts that do not depend on the specifications of the light modulation device. In the conventional light modulator driving means formed on one circuit board, a circuit board including a signal processing portion which does not depend on the specifications of the light modulator is changed according to the specifications of the light modulator of the projection display device. Therefore, there is a problem that it is not efficient in manufacturing.

Further, if the light modulator driving means is formed on one circuit board, the circuit board becomes large, which is not preferable in reducing the size of the projection display device.

An object of the present invention is to provide a light source, an optical system that optically processes a light beam emitted from the light source to form an optical image corresponding to image information, and projects an image formed by the optical system. It is an object of the present invention to provide a projection display device having a projection lens for enlarging and projecting an image on a surface, by using common components, improving productivity, and contributing to downsizing of the device.

[0007]

According to the present invention, there is provided a projection display apparatus comprising: a light source; an optical system for optically processing a light beam emitted from the light source to form an optical image corresponding to image information; A projection lens for enlarging and projecting an image formed by the optical system onto a projection surface, comprising: a light modulation device driving unit for driving and controlling a light modulation device constituting the optical system. The light modulator driving means is divided into an individual setting unit having different settings according to the specifications of the light modulator, and a common setting unit that is shared regardless of the specifications of the light modulator. Features.

Here, the individual setting section includes, for example, a phase expanding circuit for expanding an image signal supplied as serial data in accordance with the resolution of the light modulator. In addition, the common setting unit includes, for example, a look-up table (LU) that outputs a drive control signal for causing the light modulator to display a predetermined color based on an input image signal.
T) CPU for setting and controlling table information of this LUT
Etc. are included.

As the above-mentioned light modulation device, various types such as an active matrix driving type liquid crystal element, an electroluminescence element and a plasma display element can be adopted. Further, the light modulation device drive control means controls not only the drive of one light modulation device but also a three-plate type projection display device that modulates each of red (R), green (G), and blue (B) colors. This includes a case where a plurality of light modulation devices are simultaneously driven.

According to the present invention, since the light modulator driving means is divided into the individual setting section and the common setting section, even if the specifications of the light modulator of the projection display apparatus are different. If only the individual setting unit is changed, it is not necessary to change the common setting unit, rationalizing the member management, and improving the productivity of the projection display device. In addition, since the optical modulator driving unit is divided into the individual setting unit and the common setting unit, the degree of freedom in arranging the light modulator driving unit inside the projection display device is improved, which can contribute to downsizing of the device.

In the above, it is preferable that the individual setting section and the common setting section are formed on two different circuit boards, respectively, and these circuit boards are preferably arranged in a stacked manner.

That is, since the circuit board on which the individual setting section is formed and the circuit board on which the common setting section is formed are stacked, electric connection between the two circuit boards can be easily made, and the productivity is further improved. improves. In addition, since the cooling air is circulated in the space interposed between the two circuit boards, the light modulator driving means can be efficiently cooled by being arranged in a stacked manner.

The individual setting section is provided with an information carrying circuit for carrying setting information of the light modulation device, and the common setting section acquires setting information of the light modulation device from the information carrying circuit, It is preferable to provide a correction circuit for correcting input image information based on the setting information and outputting the corrected information.

Here, as the information carrying circuit, Low,
An information carrying circuit including a switching element switchable by High or the like, an information carrying circuit including a non-volatile memory for recording setting information of the light modulation device, and an information carrying circuit including both of them can be adopted.

The correction circuit includes an LUT that outputs a drive control signal for causing the light modulation device to display a predetermined color based on an input image signal, and the LUT.
A correction circuit including a CPU for setting and controlling the table information based on the setting information acquired from the information carrying circuit can be employed.

That is, since the individual setting unit includes the information carrying circuit, the setting information carried by the information carrying circuit is
The image signal obtained by the correction circuit of the common setting unit can be corrected. Therefore, even if there is a difference in the characteristics of the light modulation device, it is possible to secure appropriate color reproducibility of the projected image of the projection display device.

If the information holding circuit includes a switchable switching element, relatively simple information such as the resolution of the light modulator can be held. Specifically, when setting information relating to resolution is carried in the information carrying circuit, it can be recognized by combining switching elements that can be switched between Low and High as follows.

[0018] Furthermore, if the information carrying circuit is configured to include a nonvolatile memory, it is possible to carry complicated setting information such as an applied voltage-light transmission characteristic of the light modulation device.
Setting information of a plurality of light modulators can be recorded on one memory. In addition, as a nonvolatile memory,
Erasable Programmable Rea
d Only Memory (EPROM), Elec
Totally Erasable Programm
able Read Only Memory (E2PR
OM) or the like can be adopted. In short, various types of information can be written as long as the information can be written and the recording information is configured not to be lost even if the power of the projection display device is cut off. Things can be adopted.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

(1) Overall Configuration of Apparatus FIGS. 1 and 2 are schematic perspective views of a projection type display apparatus 1 according to the present embodiment. FIG. 1 is a perspective view as viewed from above, and FIG. It is the perspective view seen from the lower surface side.

The projection display device 1 separates a light beam emitted from a light source lamp into three primary colors of red (R), green (G), and blue (B), and separates each color light beam into a liquid crystal light valve (modulation system). And modulates the modulated light flux of each color after the modulation by a prism (color combining optical system), and enlarges and displays it on a projection surface via a projection lens 6. Except for a part of the projection lens 6, each component is housed inside the outer case 2.

(2) Structure of the Outer Case The outer case 2 is basically composed of an upper case 3 covering the upper surface of the device, a lower case 4 constituting the bottom surface of the device, and a rear case 5 covering the rear portion (FIG. 2). It is composed of

As shown in FIG. 1, the upper case 3
A large number of communication holes 25R and 25L are formed at the left and right ends on the front side of the upper surface of the. An operation switch 60 for adjusting the image quality, focus, and the like of the projection display device 1 is provided between the communication holes 25R and 25L. Further, a light receiving unit 70 for receiving an optical signal from a remote controller (not shown) is provided in a lower left portion of the upper case 3 as viewed from the front.

As shown in FIG. 2, a lamp replacement cover 27 for replacing a light source lamp unit 8 (described later) housed inside the lower case 4 and air for cooling the inside of the apparatus are provided on the bottom of the lower case 4. An air filter cover 23 having an intake 240 is provided.

As shown in FIG. 2, on the bottom surface of the lower case 4, a foot 31C is provided at a substantially central portion of a front end thereof, and feet 31R and 31L are provided at left and right corners of a rear end. . The foot 31C is connected to the lever 3 shown in FIG.
11 is lifted upward to be rotated by the rotation mechanism 312 (FIG. 2) on the rear side, and biased to a state where the front side is separated from the apparatus main body and opened as shown by a two-dot chain line in FIG. Is done. The vertical position of the display screen on the projection plane can be changed by adjusting the amount of rotation. On the other hand, the feet 31R and 31L are configured to advance and retreat in the protruding direction by being rotated, and the inclination of the lower surface of the display can be changed by adjusting the amount of advance and retreat.

As shown in FIG. 2, an AC inlet 50 for supplying external power and a group of various input / output terminals 51 are arranged in the rear case 5. An exhaust port 160 for discharging the air is formed.

(3) Internal Structure of the Device FIGS. 3 to 5 show the internal structure of the projection display device 1. FIG. 3 and 4 are schematic perspective views of the inside of the device, and FIG. 5 is a vertical sectional view of the projection display device 1.

As shown in these figures, a power supply unit 7 as a power supply, a light source lamp unit 8, an optical unit 10 constituting an optical system, and a light constituted by two circuit boards are provided inside an outer case 2. A driver board 80 serving as a modulator driving unit, a main board 12, and the like are arranged.

The power supply unit 7 includes first and second power supply blocks 7A and 7B arranged on both sides of the projection lens 6. The first power supply block 7A includes an AC inlet 5
It transforms the power obtained through zero and supplies it mainly to the second power supply block 7B and the light source lamp unit 8, and includes a transformer (transformer), a rectifier circuit, a smoothing circuit, a voltage stabilizing circuit, and the like. The second power supply block 7B
The power supply block 7A further transforms and supplies the power obtained from the power supply block 7A, and includes a transformer and various circuits similarly to the first power supply block 7A. The power is supplied to the power supply circuit board 1 disposed below the optical unit 10.
3 (shown by a dotted line in FIG. 4) and each power supply block 7A,
7B, the first and second intake fans 17A, 1
7B. In the power supply circuit on the power supply circuit board 13, the power for driving the control circuit on the main board 12 is mainly generated based on the power from the second power supply block 7B, and the power for the other low power components is provided. It is producing electricity. Here, the second intake fan 17B is disposed between the second power supply block 7B and the projection lens 6, and cools through a gap formed between the projection lens 6 and the upper case 3 (FIG. 1). It is provided so that air is sucked into the inside from the outside. Each of the power supply blocks 7A and 7B is made of a conductive cover member 2 made of aluminum or the like.
50A, 250B, each cover member 250A, 25
0B, speakers 251R, 251 for audio output are provided at positions corresponding to the communication holes 25R, 25L of the upper case 3.
L is provided.

The light source lamp unit 8 constitutes a light source part of the projection display device 1, and includes a light source lamp 181.
And a light source device 183 including a reflector 182 and a lamp housing 184 that accommodates the light source device 183. Such a light source lamp unit 8 is covered with a housing portion 9021 formed integrally with the lower light guide 902 (FIG. 5), and is configured to be detachable from the lamp replacement lid 27 described above. Behind the accommodating portion 9021, a pair of exhaust fans 16 are provided side by side at positions corresponding to the exhaust ports 160 of the rear case 5, and the first to third intake fans 17 are provided by these exhaust fans 16.
The cooling air sucked in at A to 17C is introduced into the inside from the opening provided in the vicinity of the housing portion 9021, and after cooling the light source lamp unit 8 with the cooling air, the cooling air is discharged to the exhaust port. Exhaust from 160.
The power of each exhaust fan 16 is supplied from the power supply circuit board 13.

The optical unit 10 is a unit for optically processing a light beam emitted from the light source lamp unit 8 to form an optical image corresponding to image information, and includes an illumination optical system 923, a color separation optical system 924, It is configured to include a modulation system 925 and a prism unit 910 as a color combining optical system. Modulation system 925 and prism unit 91
The optical elements of the optical unit 10 other than “0” are vertically held between the upper and lower light guides 901 and 902. The upper light guide 901 and the lower light guide 902 are integrated and fixed to the lower case 4 side with fixing screws. Further, these light guides 901 and 902 are
Side is also fixed by a fixing screw.

As shown in FIG. 6, the prism unit 910 having a rectangular parallelepiped shape is fixed to a back surface side of a head body 903 which is a substantially L-shaped structure formed from an integrally molded product of magnesium by a fixing screw. I have. The modulation system 92
5, each liquid crystal light valve 925R, 925G,
925B is disposed to face three side surfaces of the prism unit 910, and is similarly fixed to the head body 903 by fixing screws. It should be noted that the liquid crystal light valve 925B has a liquid crystal light valve 925 with the prism unit 910 interposed therebetween.
It is provided at a position facing R (FIG. 7), and FIG. 6 shows only the lead line (dotted line) and the sign. And
These liquid crystal light valves 925R, 925G, 925
B is a third intake fan 17C located on the lower surface of the head body 903 and provided corresponding to the above-described air intake 240.
Cooled by cooling air from At this time, the electric power of the third intake fan 17C is supplied from the power supply circuit board 13 via the driver board 80. Further, the head body 9
A base end of the projection lens 6 is similarly fixed to the front surface of the lens 03 by a fixing screw. The head body 903 on which the prism unit 910, the modulation system 925, and the projection lens 6 are mounted is fixed to the lower case 4 with fixing screws as shown in FIG.

The driver board 80 includes the modulation system 9 described above.
25 liquid crystal light valves 925R, 925G, 925
B is for driving control and is composed of an individual setting board 81 and a common setting board 82 to be described later.
The individual setting board 81 and the common setting board 82 are stacked and arranged above the optical unit 10, and the individual setting board 81 and the common setting board 82 arranged below are separated from each other via stud bolts 9011. Many circuit elements (not shown) forming a control circuit are mounted on the surfaces facing each other. Although not shown, both substrates 81 and 82 are
They are electrically connected by connectors provided at corresponding positions on the surfaces facing each other.

The cooling air sucked by the third intake fan 17C is supplied to the liquid crystal light valve 92.
After cooling 5R, 925G, and 925B, it is supplied to the space between the individual setting board 81 and the common setting board 82, and cools the circuit elements on each board 81, 82.

The main board 12 is provided with a control circuit for controlling the whole of the projection display device 1, and is provided upright beside the optical unit 10. Such a main board 12 is electrically connected to the above-described driver board 80 and the operation switch 60, and further includes an input / output terminal group 51
Are electrically connected to the interface board 14 and the video board 15 provided with the power supply circuit board 13, and are connected to the power supply circuit board 13 via a connector or the like. The control circuit of the main board 12 is driven by power generated by the power supply circuit on the power supply circuit board 13, that is, power from the second power supply block 7B. The cooling of the main board 12 is performed by cooling air flowing from the second intake fan 17B through the second power supply block 7B.

In FIG. 3, a guard member 19 made of metal such as aluminum is disposed between the main board 12 and the outer case 2 (only the lower case 4 and the rear case 5 are shown in FIG. 3). The guard member 19 has a large planar portion 191 extending over the upper and lower ends of the main board 12, the upper side is fixed to the cover member 250 </ b> B of the second power supply block 7 </ b> A with fixing screws 192, and the lower end is formed of the lower case 4. For example, the upper case 3 is engaged and supported by a slit. As a result, when the upper case 3 is attached to the lower case 4, interference between the upper case 3 (FIG. 1) and the main board 12 is prevented, and the main board 12 is protected from external noise. I have.

(4) Structure of Optical System Next, the optical system of the projection display device 1, that is, the optical unit 10
Will be described based on the schematic diagram shown in FIG.

As described above, the optical unit 10 includes the illumination optical system 923 for equalizing the in-plane illuminance distribution of the light beam (W) from the light source lamp unit 8, and the illumination optical system 923.
A color separation optical system 924 that separates the light beam (W) from the light into red (R), green (G), and blue (B), and a modulation system 925 that modulates each color light beam R, G, and B according to image information. And a prism unit 910 as a color combining optical system that combines the modulated light beams.

The illumination optical system 923 includes a reflection mirror 931 that bends the optical axis 1a of the light beam W emitted from the light source lamp unit 8 toward the front of the device, and a first lens plate 921 that is disposed with the reflection mirror 931 interposed therebetween. And a second lens plate 922.

The first lens plate 921 has a plurality of rectangular lenses arranged in a matrix. The first lens plate 921 divides a light beam emitted from a light source into a plurality of partial light beams, and splits each of the partial light beams into a second lens. Light is collected near the plate 922.

The second lens plate 922 has a plurality of rectangular lenses arranged in a matrix, and converts each partial light beam emitted from the first lens plate 921 into a liquid crystal light valve constituting a modulation system 925. 925R, 925G, 925
B (described later).

As described above, in the projection type display apparatus 1 of this embodiment, the liquid crystal light valve 925 is
Since the R, 925G, and 925B can be illuminated with light having substantially uniform illuminance, a projection image without illuminance unevenness can be obtained.

The color separation optical system 924 includes a blue-green reflecting dichroic mirror 941 and a green reflecting dichroic mirror 9.
42 and a reflection mirror 943. First, in the blue-green reflecting dichroic mirror 941, the blue light beam B included in the light beam W emitted from the illumination optical system 923 is used.
The green light flux G is reflected at a right angle, and travels toward the green reflection dichroic mirror 942.

The red light beam R passes through the blue-green reflecting dichroic mirror 941, is reflected at a right angle by the rear reflecting mirror 943, and is emitted from the emission portion 944 of the red light beam R to the prism unit 910 side. Next, of the blue and green luminous fluxes B and G reflected by the blue-green reflecting dichroic mirror 941, the green reflecting dichroic mirror 94
In 2, only the green light flux G is reflected at a right angle, and is emitted from the emission unit 945 of the green light flux G to the prism unit 910 side. The blue light flux B that has passed through the green reflection dichroic mirror 942 is emitted from the emission section 946 of the blue light flux B to the light guide system 927 side. In this example, the emission portions 944, 945, and 94 of the respective color light beams R, G, and B in the color separation optical system 924 from the emission portion of the light beam W of the illumination optical system 923.
The distances to 6 are all set to be equal.

The red and green luminous flux R of the color separation optical system 924
Condensing lenses 951 and 952 are arranged on the emission sides of the G emission sections 944 and 945, respectively. Therefore, the red and green light fluxes R and G emitted from the respective emission portions are incident on these condenser lenses 951 and 952 and are parallelized.

The red and green light fluxes R and G thus collimated pass through the incident side polarizing plates 960R and 960G, enter the liquid crystal light valves 925R and 925G, are modulated, and image information corresponding to each color light is modulated. Will be added. That is, these liquid crystal light valves 925R and 925G are
The switching control is performed by the above-described driver board 80 in accordance with the image information, whereby the modulation of each color light passing therethrough is performed. On the other hand, the blue luminous flux B is
The light is guided to the corresponding liquid crystal light valve 925B via 27, where it is similarly modulated according to image information. Incidentally, the liquid crystal light valves 925R, 9
As 25G and 925B, for example, polysilicon TF
An element using T as a switching element can be employed.

The light guide system 927 includes an emission section 94 for the blue light beam B.
6, a condenser lens 954 disposed on the exit side of the light-receiving element 6, an incident-side reflection mirror 971, an exit-side reflection mirror 972, an intermediate lens 973 disposed between these reflection mirrors, and disposed on the front side of the liquid crystal light valve 925B. Condensing lens 95
The blue light flux B emitted from the condenser lens 953 passes through the incident-side polarizing plate 960B, enters the liquid crystal light valve 925B, and is modulated. At this time, the optical axis 1a of the light beam W and the optical axis 1r of each color light beam R, G, B,
1g and 1b are formed in the same plane. The length of the optical path of each color light beam, that is, the light source lamp 181
The distance from to each liquid crystal panel is the longest for the blue luminous flux B, and therefore, the loss of light quantity of this luminous flux is greatest. However, by interposing the light guide system 927, the light amount loss can be suppressed.

Next, each liquid crystal light valve 925R, 92
R, G, and B light beams modulated through 5G and 925B, respectively.
Are incident on the prism unit 910 through the exit-side polarizing plates 961R, 961G, and 961B, and are synthesized there. The color image synthesized by the prism unit 910 is enlarged and projected on the projection surface 100 at a predetermined position via the projection lens 6.

(5) Structure of Light Modulator Drive Control Unit (Driver Board) 80 As described above, the driver board 80 has liquid crystal light valves 925R, 925G, as shown in the block diagram of FIG.
Individual setting board 81 with different settings according to 925B specifications
And a common setting substrate 82 that is shared regardless of the specifications of the liquid crystal light valves 925R, 925G, and 925B.

The common setting board 82 includes the signal processing block 8
3. It includes a timing circuit block 84, a CPU 85, and an amplifier 86, and the signal processing block 83 and the CPU 85 form a correction circuit.

The signal processing block 83 causes the liquid crystal light valves 925R, 925G, and 925B to perform appropriate color display based on the image signal VIDEO input from the input / output terminal group 51 of the interface board 14 via the video board 15. For outputting drive control signals SR, SG, and SB for the respective liquid crystal light valves 925R, 925R
It has three look-up tables (LUTs) 83R, 83G, and 83B set according to 25G and 925B.

The timing circuit block 84 is a signal processing block 8 based on the vertical and horizontal synchronization signals SYNC.
3. Phase expansion circuit blocks 87R, 87G, 87 described later
B, and each liquid crystal light valve 925R, 925G, 9
25B is a block for outputting a drive timing signal ST to a driver IC (not shown) provided in the 25B.

The CPU 85 controls the signal processing block 83 and the timing circuit block 84.
The table information of the LUTs 83R, 83G, and 83B is set and controlled, and the output of the timing circuit block 84 is controlled. The CPU 85 includes a switching element block 88 and a memory block 89 described later.
And is configured to be able to acquire information carried on them. Then, the drive control signal S
R, SG, and SB are D / A-converted inside the LUTs 83R, 83G, and 83B, amplified by the amplifier 86, and output to the individual setting board 81.

The individual setting board 81 includes the phase development circuit blocks 87R, 87G, 87B, and the switching element block 8.
8 and a memory block 89, and the phase development circuit block 87 includes the liquid crystal light valves 925R,
925G and 925B.

Phase expansion circuit blocks 87R, 87G, 87
B is a liquid crystal light valve 925R, 925G, 925B
Drive control signals SR, SG, SB according to the resolution of
Is a part where phase development is performed. Thus, the drive control signal S
By developing the R, SG, and SB phases, the liquid crystal light valves 925R, 925G, and 925B that are originally slow in operation speed
Can be quickly operated according to the change of the image signal VIDEO. The phase expansion circuit block 8 in this example
7R, 87G, and 87B can be configured by combining a plurality of ICs (not shown) set to a predetermined number of development phases. Specifically, each phase expansion circuit block 87R, 87
The G and 87B are provided with four connecting portions (not shown) for connecting ICs that develop signals in six phases. The resolution of the liquid crystal light valves 925R, 925G, and 925B is V
In the case of GA and SVGA, one IC is connected for 6-phase development, and in the case of XGA, two ICs are connected for 12-phase development.
In the case of SXGA, four ICs are connected to develop 24 phases.

The switching element block 88 is Lo
w, two resistance switches 881 that can be switched to High,
882, and two resistance switches 881, 88
The resolution that can be supported by the individual setting board 81 can be determined by the combination of the two switching states. In the case of this example, the following combinations are set.

[0057] The memory block 89 is composed of a nonvolatile E2PROM in which the recorded contents are not lost even if the power of the projection display device 1 is cut off.
The setting information of 25G and 925B is recorded. The recorded setting information includes each liquid crystal light valve 925R at the time of manufacture,
925G and 925B, or characteristic value information such as the γ characteristic, resolution information such as a refresh rate set according to the resolution, and the like can be included. In addition, such liquid crystal light valves 925R, 925G, 925B
The setting information may be obtained by measuring the light transmission characteristics of the liquid crystal light valves 925R, 925G, and 925B after manufacturing the projection display device 1 and recording the values in the memory block 89.

(6) Operation of Light Modulating Device Driving Means (Driver Board) 80 Next, the operation of the driver board 80 having the above configuration will be described.

When the projection display apparatus 1 is started, the CPU 85 of the common setting board 82 acquires setting information such as the resolution and the γ characteristic of each of the liquid crystal light valves 925 R, 925 G, and 925 B from the switching element block 88 and the memory block 89. LUT based on the acquired setting information
83R, 83G, and 83B table information is set. Further, the CPU 85 outputs the acquired setting information to an image output unit such as a personal computer connected to the projection display device 1 via the input / output terminal group 51 as a status signal STS.

The analog image signal input from the input / output terminal group 51 is digitally converted by the video board 15 or the like, and constitutes the signal processing block 83 as a digital image signal VIDEO composed of 8 bits for each of R, G, and B colors. LUTs 83R, 83G, and 83B.

In each of the LUTs 83R, 83G, and 83B, an image signal VIDEO is used as an index for each of R, G, and B colors, and table information corresponding to this signal is internally converted into an analog signal, and then converted into drive control signals SR, SG, and SB. Output.

The drive control signals SR, SG, SB
Are supplied to the phase development circuit blocks 87R, 87G, 87B of the individual setting board 81 after being amplified by the amplifier 86. Phase expansion circuit blocks 87R, 87G, 87
In B, the liquid crystal light valves 925R, 925G, 925
The drive control signals SR, SG, and SB are phase-expanded based on the number of expansions set according to the resolution of B, and output to the driver IC (not shown) of each of the liquid crystal light valves 925R, 925G, and 925B.

On the other hand, the synchronization signal SYNC input together with the image signal VIDEO is supplied to the timing circuit block 84. Timing circuit block 84
Is a synchronization signal SYNC and a control signal SC from the CPU 85.
, A drive timing signal ST is output to the signal processing block 83, the phase expansion circuit blocks 87R, 87G, 87B, and the driver ICs of the liquid crystal light valves 925R, 925G, 925B, and the cooperative operation is performed.

(7) Effects of the Embodiment According to this embodiment, the following effects can be obtained.

Since the driver board 80 serving as the light modulation device driving unit is divided into the individual setting board 81 and the common setting board 82, the specifications of the liquid crystal light valves 925R, 925G, and 925B of the projection display device 1 are different. However, if only the individual setting board 81 is changed, it is not necessary to change the common setting board 82, so that the member management can be rationalized and the productivity of the projection display apparatus 1 can be improved. Further, since the substrate is divided into the individual setting substrate 81 and the common setting substrate 82, the degree of freedom of arrangement of the driver board 80 inside the projection display device 1 is improved, and the projection display device 1 can be downsized. .

The individual setting board 81 and the common setting board 82
Are stacked, the two circuit boards 81, 8
2 can be directly electrically connected by a connector, and with the simplification of wiring processing, the productivity of the projection display device 1 can be further improved. In addition, since the two substrates 81 and 82 are stacked and arranged, the cooling air sucked by the third intake fan 17C is guided to the space between the two substrates 81 and 82, so that the circuit elements on the substrates 81 and 82 are connected. It can be cooled efficiently.

Since the individual setting board 81 includes the memory block 89 serving as an information carrying circuit, the deviation, the γ characteristic, and the like of each of the liquid crystal light valves 925R, 925G, and 925B can be recorded in the memory block 89. it can. Then, by using the setting information in the CPU 85, the liquid crystal light valves 925R, 925G,
LUT 83R, 83
G, 83B, and these LUTs 83R, 83G, 8
By converting the image signal VIDEO by 3B, the color reproducibility of the projected image can be appropriately secured.

Since the individual setting board 81 includes the switching element block 88 serving as an information carrying circuit, the liquid crystal light valves 925 R, 925 G, and 925 B
Carrying simple information such as the resolution of the
Can be easily determined.

Since the memory block 89 is composed of the E2PROM, even if the power of the projection display apparatus 1 is cut off, the recording information is not lost, and the setting information can be used for a long time.

Since the phase development circuit blocks 87 R, 87 G, 87 B of the individual setting board 81 are configured so that the number of development phases can be changed, the liquid crystal light valves 925 R, 925
Even if the resolutions of G and 925B are different, it is only necessary to increase or decrease the number of connected ICs for development, the members can be further shared, and the productivity of the projection display device 1 can be further improved. .

Since the CPU 85 is configured to output the status signal STS to image output means such as a personal computer, if an image signal of a resolution not set in the projection display device 1 is set on the personal computer, With this status signal, the fact can be confirmed on the personal computer.

(8) Modifications of the Embodiment The present invention is not limited to the above-described embodiments, but includes the following modifications.

In the above embodiment, the common setting board 8
2 is stacked above the individual setting substrate 81, but is not limited to this. In other words, the common setting board 82 may be vertically arranged like the main board 12. In short, if it is advantageous to reduce the size of the projection display device,
The arrangement position may be appropriately changed.

In the above-described embodiment, the memory block 89 is configured by the E2PROM. However, the present invention is not limited to this, and the memory block 89 may be an EPROM or a RAM that can maintain power supply by a built-in battery or the like.

In the above-described embodiment, the liquid crystal light valves 925R, 925G, and 925B are employed as the light modulation devices. However, the present invention is not limited to this. A modulation device (ELD) using a light emitting element and a polymer dispersed liquid crystal are used. Modulation device (PD
P), even if the present invention is applied to a modulation device (DMD) using a micromirror, the same effects as those of the above-described embodiment can be obtained.

Then, the above-mentioned projection display device 1
Are three liquid crystal light valves 925R, 925G, 92
5B is provided, but the present invention is not limited to this, and even if the present invention is applied to a projection display device having a single light modulation device, the same effects as those of the above-described embodiment can be obtained. .

In addition, the specific structure, shape, and the like when implementing the present invention may be other structures and the like as long as the object of the present invention can be achieved.

[0078]

As described above, according to the present invention,
Since the light modulation device driving means is formed by being divided into an individual setting section and a common setting section, productivity can be improved by sharing members, and the degree of freedom of arrangement of the light modulation device driving means is increased. Thereby, the size of the device can be reduced.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a projection display device according to an embodiment of the present invention as viewed from above.

FIG. 2 is an external perspective view of the projection display device according to the embodiment as viewed from below.

FIG. 3 is a perspective view illustrating an internal structure of the projection display device according to the embodiment.

FIG. 4 is a perspective view showing an optical system inside the projection display device in the embodiment.

FIG. 5 is a vertical sectional view showing the internal structure of the projection display device in the embodiment.

FIG. 6 illustrates a modulation system, a color synthesis optical system,
FIG. 2 is a vertical sectional view illustrating a structure on which a projection lens is mounted.

FIG. 7 is a schematic diagram for explaining a structure of an optical system of the projection display device according to the embodiment.

FIG. 8 is a block diagram illustrating a structure of a light modulation device driving unit in the embodiment.

[Explanation of symbols]

 Reference Signs List 1 projection display device 6 projection lens 10 optical system 80 light modulator driving means 81 individual setting unit 82 common setting unit 88, 89 information carrying circuit (switching element, memory) 181 light source lamp 925R, 925G, 925B light modulation device

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H093 NA62 NC28 NC50 NC65 ND17 ND42 ND50 ND58 NE06 NG02 5C058 AA09 AA11 AA12 AB06 BB14 EA12 EA26 EA51 5G435 AA17 AA18 BB12 BB17 CC12 DD02 DD05 EE02 GG03 01

Claims (5)

[Claims] An optical system for optically processing a light beam emitted from the light source to form an optical image corresponding to image information; and enlarging and projecting an image formed by the optical system on a projection surface. A projection lens comprising: a light modulation device driving unit that drives and controls a light modulation device that constitutes the optical system; and the light modulation device driving unit includes a light modulation device. A projection display device, wherein the projection display device is divided into an individual setting unit having different settings according to specifications and a common setting unit which is common regardless of the specifications of the light modulation device. 2. The projection display device according to claim 1, wherein the individual setting section and the common setting section are formed on two different circuit boards, respectively, and these circuit boards are stacked and arranged. Projection type display device characterized by the above-mentioned. 3. The projection display device according to claim 1, wherein the individual setting section is provided with an information carrying circuit for carrying setting information of the light modulation device, and the common setting section is provided with an information carrying circuit. Is a projection type, comprising: a setting circuit that acquires setting information of the light modulation device from the information holding circuit, corrects the input image information based on the setting information, and outputs the corrected image information. Display device. 4. The projection display device according to claim 3, wherein the information carrying circuit includes a switchable switching element. 5. The projection display device according to claim 3, wherein the information holding circuit includes a non-volatile memory for recording setting information of the light modulation device. Projection type display device.